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The collectible Enigma Code fragments appear in the game world as red booklets with a black Wolfenstein logo on the cover, followed by the words "GEHEIM - Enigma Codes". Most code fragments are scattered about in the open just up for grabs, though others are located well out of sight, usually requiring the player to traverse a hidden, sometimes dangerous area to reach. Interacting with certain objects in the environment in a correct manner will sometimes yield cleverly-hidden code pieces.

Solving each code unlocks a bonus game mode with rules altered from the normal gameplay such as unlimited ammo, HUD removal, absence of collectibles and the inability to use or acquire perks.

There are a total of 72 enigma codes that are scattered around the entirety of the game's Campaign. Each of these codes contain a particular pair of digits separated by a colon (e.g, "Code fragment 1:1") that are part of a larger code necessary in order to crack the four enigma secrets. Thus, each secret will contain 18 codes.

On the Extras screen, each code is represented by two rows of values. Calling the first value of each row "n", this is the number before the colon (e.g, Code fragment 1 reads "1:1", therefore the first value of Row 1, Code 1 is 1).

Unlocks the 999 mode. Difficulty is set to Über, but the player starts with 999 temporary health that slowly decays down to 100. All weapons have infinite ammo and the player can use an unlimited amount of grenades.

Note that even with 999 points of health the player can still die from falling off of ledges or scripted instant deaths such as being attacked by a Panzerhund.